In ruminants, another source of EAA is derived from the digestion of microbial protein that is produced as a by-product of fibre digestion. A similar process occurs in donkeys, although the microbial-derived EAA cannot be digested or absorbed before they are excreted in the faeces. However, the ability of donkeys to thrive and grow on the very low protein forages found in many tropical countries does provide some anecdotal evidence that processes of protein digestion and metabolism in donkeys are more complex than is currently perceived. | In ruminants, another source of EAA is derived from the digestion of microbial protein that is produced as a by-product of fibre digestion. A similar process occurs in donkeys, although the microbial-derived EAA cannot be digested or absorbed before they are excreted in the faeces. However, the ability of donkeys to thrive and grow on the very low protein forages found in many tropical countries does provide some anecdotal evidence that processes of protein digestion and metabolism in donkeys are more complex than is currently perceived. |